This is kind of an open-ended question, as you've probably seen. Ask 40 different people and get 40 different answers. I guess it really boils down to the person's approach to modeling. For me, I build to relax & enjoy my time at the bench, so I prefer kits the fit well. Minor fit issues I can understand & deal with (minor flash, mold lines, etc.), but I do not want to have to fight to get a kit to fit. This to me is frustrating & not enjoyable. AMT, MPC, and in some cases, Revell kits generally fit into this category, mostly due to the age of the molds. Tamiya kits fit well, although they can be a little fiddly at times. Many of the Revell kits fit well, and the Italeri kits I've built have fit ok. The one Moebius kit I built fit well, although the instructions were difficult to interpret. I cannot speak to Fujimi, Hasagawa, NuNu, or SalvinosJR as I have not built any of their kits yet. Don't get me wrong. I have seen some fantastic builds from AMT & MPC kits, and I have built several of their kits; however, for the frustration they usually bring, I don't think they are worth the $40-45 (maybe $25).